Additionally, you will complete a dual energy x-ray absorptiometry (DEXA) scan to evaluate body composition. The DEXA scan exposes your body to radiation. The radiation you will receive is about a 10th of the radiation of a chest x-ray. If you are female, you will be asked if you are pregnant. If you state that you are not pregnant, you will receive the DEXA. If you are not sure if you are pregnant, you will have a urine pregnancy test done. If you are pregnant, you will not be able to take part in this study.